Prevalence and Determinants of Tuberculous Infection in Children in Bale Region.
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Date
1989-05
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Addis Abeba Universty
Abstract
The determination of the prevalence of tuberculosis infection, I i thinage groups and the relation of lnfection to factors under study , i,e.,previous BeG vaccination, raw milk consumption, and •intimate exposure tocattle VJere evaluated in a c ross-sect l cna l community-based t ubercu lin skintest survey, and case-control analysis of the re13tion of infectlon to thefactors unde r- study in Mendeyo Awraja, Ba 'le region (south-east Etniopia) 1in chi ldren 6 months to ~5 years at age. A su rvey consisting of aninterview, exami nati orl of BeG scar on the ri ght shoulder , and tuberculinskin testing and re a::.nng io-Jas conductea en 1892 children, ldentified bysystematic househo ld survey from ten randoml y se lected peasant Yl1 lages inMendeyo Awraja.Out of the total 1892 children surveyed 1002 (53%) were males and890 (47%) were females . 1028 (54.3%) had a BeG scar and 864 (45.7%) hadno BeG scar ; the prevalence of tubercul osis infection in these groups was1 'I .8% and 15.3% respect i ve 1 y • The overall prevalence of tUberculosisinfection 1'i3S 13.4%. The mean age of the surveyed children \'Ias 6 years .Preva lence of i nfeet i on was low ; n infants and chi 1 dren under 5 years ofage and increases \•Jith age , being high in 12 to 15 years old. There vJas asignl f icant as socia tion between infect i on and previo us no n-BeGvacc inat ion, and intimate exposure to catt le, as determined by ch i squarestatistics (p < .05). There was no significant associat ion betweenI'n.f,e c +.... l'0 n and raw cow'~ mi l k co nsump~ ion (p > . 05).The average alillU(l.L risk of infec1;ion as cRJ.cul ateci. fro31 the results of thestudy in non-vaccl:1atect Gill J.drcn '':is 2.73%. Incidence of smear-posi ti vepulmonary tuber culosis cases was r:.alcvlated to be about 387 cases per290,000 population (the settled awraja' s population I . The study ha.senabled us to determine the annual risk of infection and incidence of smear- positive pulmonary t uberculosis cases iL the community (awraja).
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Keywords
Tuberculous Infection ,Children ,Bale Region